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Mechanism of Adhesion between Polymer Fibers at Nanoscale Contacts

Qiang ShiState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, ChinaShing‐Chung WongDepartment of Mechanical Engineering, The University of Akron, Akron, Ohio 44325-3903, United StatesWei YeChangchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, ChinaJianwen, HouChangchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, ChinaJie ZhaoChangchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, ChinaJinghua YinDepartment of Mechanical Engineering, The University of Akron, Akron, Ohio 44325-3903, United States

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Annotatsiya

Adhesive force exists between polymer nano/microfibers. An elaborate experiment was performed to investigate the adhesion between polymer nano/microfibers using a nanoforce tensile tester. Electrospun polycaprolactone (PCL) fibers with diameters ranging from 0.4-2.2 μm were studied. The response of surface property of electrospun fiber to the environmental conditions was tracked by FTIR and atomic force microscopy (AFM) measurements. The effect of temperature on molecular orientation was examined by wide angle X-ray diffraction (WAXD). The adhesive force was found to increase with temperature and pull-off speed but insensitive to the change of relative humidity, and the abrupt increase of adhesion energy with temperature accompanied by a reduced molecular orientation in the amorphous part of fiber was observed. Results show that adhesion is mainly driven by van der Waals interactions between interdiffusion chain segments across the interface.

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Identifikatorlar

DOI: 10.1021/la204633c

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